Ventilator.



A. w. BANISTER, 05041. E- l- BANISTER. ADMINIST RATRIXL VENTILATOR. APPLICATION FILED APR. 29. 1913.

Patented Mar.'7,1916.

Invenior:

miness es w; a i w THE COLUMBIA PLANOORAPH co., WASHINGTON, D. c.

UNITED STA ES AT NI OFFICE? ARTHUR w. nANIs En, or noRoHEsTEit, MAssAcHUsETTs; EMMA J. BANISTEB, or BosToN, MASSACHUSETTS, ADnINIsTRATmX or SAID ARTHUR w. BANI TER,

DECEASED.

UVENTILATOR.

1,174,038. Specification of Letters Patent. P t t d pl 1916;

Application filed April 29, 1913. Serial No. 764,364.

To all whom it may concern:

7 ing description of an illustrative embodiment thereof shown in the accompanying drawing, wherein: V

Figure 1 1s a vertical section through an illustrative ventilator shown herein as em".

bodying the invention; and Fig. 2 is a section taken on line 22 of Fig. 1.

Referring to the drawing, the illustrative ventilator shown therein as embodying the invention comprises a chimney or flue 1 on which is mounted a duct or funnel 3. flared toward its delivery end to facilitate the discharge of air or other gas from the flue 1, as more fully hereinafter described. Depending from said funnel is a collar 5 preferably spaced somewhat from the tube 1 to permit an upward draft of air therethrough.

Within the funnel 3 is a duct 7 having a flared end fitted into and secured to the windward end of the outer duct '3. This inner duct extends a substantial distance within the outer duct and across the upward flue a substantial distance above the latter.

' It will be observedthat the outer and inner ducts diverge in opposite directions. The convergence of the inner duct tends to accelerate the passage of air therethrough and thereby promotes a draft or suction up through the flue 1. The inner duct is formed to present an inclined portion 9 which deflects the gases from the flue l toward the discharge end of the funnel 3.

An important feature of the invention relates to the pivotal mounting of the ducts on the flue '1. To this end there is provided a spindle or shaft 11 supported by brackets 13 and 15 extending across the flue 1adjacent the upper and lower ends thereof.

This spindle projects above the fluevtoward the under face of the inner duct :7 and passes through a bearing'bracket17 extendfunnel 3. The upper end of this spindle is mg acrossand Secured to the neck 5'of the 5 tapered to receive an end thrust bearing 7 block 19 secured to the under face of the duct 7 It will be observed that the spindle does not project into the inner duct 7, but on the contrary terminates beneath the under side thereof, thereby leaving the duct unobstructed and permitting the free pas sage of air therethrough. Also the spindle PIOJGCtS but-a slight distance above the neck 5 and offers but a minimum. obstruction to the funnel 3. This pivotal connection between the inner duct and the flue l is an extremely simple construction, facilitating the ready assembly of the parts and permits the rotation of the ducts about theflue 1 with very slight frictional resistance.

To turn the ducts on the spindle, as described, so as to present the entrance end of the inner duct 7 toward the wind the funnel 3 may be provided on its upper side with an appropriate vane 23. t

It frequently happens that these chimney ventilators must be located near awall, such for example as that of an adjacent building. The impact ofair against such wall would I tend to slow up the air current, but by the funnel shaped tube 7 the velocity of the air is increased so that under such circumstances .it is effective in promoting the draft. The funnel 3 1n flaring in an opposite direction from the inner tube 7, compensates for the obstruction thereof by the inner duct and provides for the free egress of the currents in their passages from the fixed flue 1.

It will be observed that the windward end of the ventilator tube 7 is closed to the fixed flue 1. By virtue of the vane 28 the ventilator is always turned to present said end to the wind. As a result, there can be no possibility of downward puffs in thefixed flue 1, but on the contrary a continuous upward draft through said flue is maintained.

Having described one embodiment of the invention, without limiting the same thereto, what'I claim as'new and desire to secure by Letters'Patent is:

A ventilator comprising in combination, an upright flue, oppositely diverging outer and inner ducts, the outer duct having a discharge end substantially larger than the inlet end of the inner duct, the smaller end of said outer duct being secured rigidly directly to the larger end of said inner duct,

said inner duct having a contracted passage portion ofiset upvvardfrom" the central axial line of its larger end and a Wall sharply inclined from said larger end upward to said portion, for leaving a large free passage above said flue for conducting gases from the latter to the discharge mouth of said outer duct, a vane for directing said ducts,

Copies of this patent may be obtained for and means providing a pivotal mounting 10 five cents each, by addressing the Commissioner of Patents, Washington, D. C. i 

